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.270 win and 7mm mag are pretty similar on paper. If you're shooting the 7mm mag from a short-ish barrel, 22-24inches, then the .270 is probably the better choice, as the 7mm wont have much of an advantage over the .270 with that barrel length. With a barrel that short, you are essentially turning any extra MV and ME you may have had, and turning it into extra recoil and muzzle flash.
The 7mm has some better high BC bullet choices, in the heaviest weights, but the Nosler accubond 'long range' makes a .277 150 grain, with a listed G1 BC of .625, which is quite high.
With that bullet, on paper, you have over 1550ft/lbs of energy @ 500 yards and over 1000ft/lbs energy @ 850 yards.
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